常见的砖混结构过梁形式有（）。A、钢筋混凝土过梁  B、钢结构过梁  C、钢筋砖过梁

As Philadelphia grew from a small town into a city in the first half of the eighteenth century, it became an increasingly important marketing center for a vast agricultural hinterland. Market days (1) the crowded city even more crowded, as farmers from within a (2) of 24 or more kilometers brought their sheep, vegetables, cider and other products for direct sale to the (3) . The High Street Market was continuously (4) throughout the period until 1736, (5) it (6) from Front Street to Third. By 1745 New Market was opened on Second Street. The next year the Callow Hill Market began (7) .

Along with market days, the (8) of twice-yearly fairs persisted in Philadelphia (9) after similar trading days had been discontinued in other colonial cities. The (10) provided a means of bringing handmade goods from (11) places to would-be buyers in the city. Linens and stockings from Germantown, (12) , were popular items.

Auctions were another popular (13) of trade. Because of the competition, retail (14) opposed these as well as the fairs. (15) governmental attempts to eradicate fairs and auctions were less than successful, the ordinary (16) of economic development was on the merchants’side, as increasing business specialization became the (17) of the day. Export merchants became differentiated from their importing counterparts, and specialty shops began to appear (18) general stores selling a variety of goods.

One of the reasons Philadelphia’s merchants prospered was because the surrounding area was undergoing tremendous economic and demographic growth. They did their business, (19) , in the capital city of the province, (20) to not only the governor and his circle, but citizens from all over the colony.

13（）

A.solution

B.format

C.style

D.form

用于治疗夜盲症、眼干燥症（）

A．维生素A

B．维生素C

C．维生素E

D．骨化三醇

E．烟酰胺

少量的金属钠长期暴露在空气中，它的最终产物是

A．NaOH

B．Na₂CO₃?10H₂O

C．Na₂CO₃

D．NaHCO₃

某兴趣小组设计并进行了以下实验来制取氯水，并利新制用氯水完成实验。

（1）实验室拟用下列装置制备氯水，请按照气体从左向右流动的方向将仪器进行连接：

H→　　　_____________（填接口处的符号）；广口瓶Ⅱ中的试剂为　　　　　　　　　。

（2）写出该实验中制取Cl₂的化学方程式为：___________________________________

（3）某兴趣小组设计实验除去氯化钾中含有Fe³⁺、SO₄^2-、Br^-等杂质离子，步骤如下：

A．溶解，在所得溶液中加入试剂至Fe³⁺、SO₄^2-沉淀完全，煮沸；

B．过滤，在滤液中加入盐酸调节pH；

C．加入_____（除Br^-）；蒸干灼烧。请回答问题：

（3）①步骤a中，依次加入的试剂是NH₃.H₂O、_________、_________。

②步骤c中加入的试剂是__________________。

（4）某研究性学习小组用KSCN检验FeSO₄溶液中的Fe²⁺时，加入过量浓HNO₃，溶液的颜色变红。但是将红色溶液放置一会则发现溶液由红色突然变为蓝色，并产生红棕色气体。对这一奇特现象同学们进行了以下探究。

［查阅资料］：

(SCN)₂称为拟卤素，性质与卤素单质相似，(SCN)₂、Cl₂、Br₂、I₂四种物质的氧化性强弱为：Cl₂＞Br₂＞(SCN)₂＞I₂。

［提出假设］：

①甲同学假设是FeSO₄与HNO₃作用；乙同学假设是______与HNO₃作用。

［实验验证］：

②大家经过理性分析，认为甲同学的假设不成立。理由是________________________。

③根据乙同学的假设，设计了如下实验方案进行验证：向浓HNO₃中逐滴加入KSCN溶液，实验开始时无明显现象，一段时间后溶液慢慢变红色至深色，突然剧烈反应产生大量气泡，放出红棕色气体。将产生的气体通入过量的Ba(OH)₂溶液，产生浑浊，并剩余一种气体（是空气中的主要成分之一）；向反应后的溶液中加入BaCl₂溶液产生白色沉淀。

则反应中产生的气体是：_______________________________

［实验结论］：乙同学假设正确。

［实验反思］：

④由实验可知：用SCN^-间接检验Fe²⁺时，加入的氧化剂除用HNO₃外还可以选择氯水等，通过该实验探究可知加入氧化剂的量必须要_______（填“少量”、“过量”）。

承租人在融资租赁谈判和签订租赁合同过程中发生的、可直接归属于租赁项目的初始直接费用，如印花税、佣金、律师费、差旅费等，应当( )。

A．计入当期费用
B．计入租入资产价值
C．部分计入当期费用，部分计入租赁成本
D．计入最低租赁付款额